Horn and amplifier for sound-recording and sound-reproducing apparatus



June so, 1925. 1,544,460

G. LAKHOVSKY HORN AND AMPLIFIER FOR SOUND RECORDING AND SOUND REPRODUCING APPARATUS 'Fi led'Feb. 24,, 1923 4 Shsets-Sheat 2 Fig IN VENTOQ Gaogazs LAKHQVSKY June 30, 1925. 1,544,460

- G. LAKHOVSKY HORN AND AMPLIFIER FOR SOUND RECORDING AND SOUND REPRODUCING APPARATUS Filed'Fb. 24, 1923 v 4 Sheets-Sheet 5 Fig.4.

Game asslmwov s. LAKHOVSKY HORN AND AMPLIFIER FOR SOUND RECORDING AND SOUND REPROD GING APPARATUS FiledTeb. 24, 192; 4 sheets-sheet 4 June 30, 1925. 1,544,460

Fig. 5.

. //v vezvroe 6502055 Lax/{ovary IITOENE Y3 Patented June 30, 1925.

UNITED STATES .GEORGES LAKHOVSKY, OF PARIS, FRANCE.

HORN AND AMPLIFIER FOR SOUND-RECORDING AND SOUND-REPRODUCING APPARATUS.

Application filed February 24, 1923. Serial No. 621,036

To al 11 7:0211. it may conccmt:

Be it known that I, Gnomes LAKHovsKY, of 5 Avenue du Bois-de-Boulogne, Paris, France, engineer, have invented an Improved Horn and Amplifier for Sound-Recording and Sound-ReproducingApparatus, of which the following is a full, clear, and exact description.

The horns or sound amplifiers, with which apparatus for recordin and reproducing sound are usually provi ed, generally suffer from the disadvantage of having notes to which they resound and of producing resonance phenomena which alter the nature of the sound and more particularly of the voice.

This invention has for its objects an improvement in horns or sound amplifiers, in order to obviate the disadvantage. indicated above.

This improvement is characterized essentially in that the horn is provided, over the whole of its height or over a part only, with a casing or jacket, there being left between this casing or jacket and the horn proper a space that contains a substance which forms a damper.

As substance forming a damper, use will preferably be made of a viscuous or mucilaginous thick liquid, for instance oil, glycerine, a solution of gum, of gelatin, etc., or yet wax, paraflin, rosin, etc.

By means of the present invention the metallic vibrations of the horn are damped, and the sounds amplified by the horn are no lon er subject to any deterioration.

'l he present invention is applicable to horns of any kind, shape and material.

In the accompanying drawing:

Fig. 1 is a view in elevation of a horn constructed according to the present invention.

Fig. 2 is a longitudinal section thereof.

Fig. 3 shows in vertical section another form of construction.

Fig. 4 illustrates a modification.

Fi 5 shows in vertical'section a photograp ic apparatus provided with an inner horn constructed according to the invention.

Fig. 6 is a detail view showing this horn in perspective.

As shown in Fi l and 2 the horn proper a is provided wit a casing or 'acket b; the space between the horn a an this casing or jacket b is completely closed and con tains a liquid 0, preferably thick, viscuous In the form of construction illustrated in 1 Fig. 3 the casing 12 is so shaped that the periphery of its flared part is headed in a guard or keeper a formed on the periphery of the horn, proper a,- at the other end, a lining or annular plug f is brazed or soldered between the narrow end of the hornand the end of small diameter of the casing.

On its flared surface, the casing is provided, as illustrated in Fig. 3, by way of example, with a filling up tube d having a closing plug 41 and through which is introduced the damping liquid adapted'to fill up the space between the horn (1 and the casing b. 4

The damping liquid might also be introduced in the space separating the horn from the casing after these latter. have been connected together by heading of their flared edge and before placing in position and soldering of the lining or annular plug f, as illustrated in Fig. 4.

This liquid might again be introduced, after effecting the connection of the horn and casingand placing in position of the lining or annular plug f, by means of any openin provided in the casing and closed by sol ering or any other means after filling up.

Figs. 5 and 6 shows the invention as applied to a phonographic apparatus provided with an inner horn; in this case, the latter is constituted in the following manner:

The horn proper a is provided on each of its faces with a casing 12 and the interval comprised between the faces of the horn a and those of this casing b is filled with a substance forming a damper as previously stated.

The casing b will be mounted on the horn a by any suitable means and the interval comprised between this casing and the horn will be closed by a plug f secured for instance by soldering after the filling up of this interval with the substance forming a damper.

This type of horn, in the shape of a frustum of a pyramid, might also be constituted by four panels having a double thickness with an inner filling by means of a substance forming a damper as above set forth. The panels, of double thickness, being assembled by any known means (glue, nails, s rews, etc.).

In a horn thus constructed, the layer oi: liquid surrounding the horn proper a, has for its effect to'damp the metallic vibrati ns of the latter and to suppress the resonancephenomena which occur, as has been mentioned above, in ordinary horns.

By employing the improved horn de scribed above both in recording apparatus and in reproducing apparatus, the sounds and more especially the voice are recorded and reproduced with a greater amount of purity and without losing their natural chara ter.

According to the purposes to which the horn is to be applied, the casing or jacket containing the damping substance may be extended over the whole height of the horn or over only a part thereof.

The improved horn or amplifier is applicable to all sound recording apparatus and to all reproducing apparatus, such as phonographs, loud speaking apparatus and more especially those employed in wireless telephony.

It is obvious that the methods or carrying the invention into practice described above are only given by way of example and that the dimensions, the shape and de tails of construction oi this improved horn can be modified according to the different purposes to which it is to be applied, as can also the material employed in the construction of the horn.

Claims:

1. A reinforcing born for recording apparatus and sound reproducing apparatus, comprising a double casing and, in the space comprised between the horn and this double casing, a pasty material haying for effect to damp the Vibrations which might be trans mitted to the horn by the sonorous waves.

2. A reinfor ing horn for recording apparatus and sound reproducing apparatus. omprising a double casing): and. in the space omprised between the horn and this double casing, a pasty yiscuous material having for effect to damp the vibrations which might be transmitted to the horn by the sonorous waves.

3'. A reint'orcin; horn 'lor recording apparatus and sound reproducing! apparatus. comprising a double casing and. in the space comprised between the horn and this double casing, parafiiii havin; tor effect to damp the yibrations whi=-h might be transmitted to the horn by the sonorous waves.

*1. A reinforcing horn for recording apparatus and sound reproducing apparatus comprising: a double casing beaded, on the one hand, in the flared ed ie of the horn and extending, on the other hand, up to the nar row end of this horn, in the space comprised between the horn and this double casing, a pasty viscuous material adapted to damp the vibrations which might be transmitted to the horn by the sonorous waves, and an annular plug closing the annular orifice comprised between the narrow end of the horn and the end of the double casing.

5. A reinforcing horn for recording apparatus and sound reproducing apparatus comprising: a double casing beaded, on the one hand, in the flared edge of the horn and extending, on the other hand, up to the narrow end of this horn, paratlin hllin; up the space comprised between the horn and its double casing, and an annular plug closing the annular orifice comprised between the narrow end of the horn and the end of the double casing.

Signed by me this 1st day of February 1923.

GEORGES LAKHUVSK Y. 

